code: def test_create_ratings_matrix_not_sparse(explicit_df):
      actual = create_ratings_matrix(
          df=explicit_df,
          user_col="userId",
          item_col="itemId",
          ratings_col="rating",
          sparse=False,
      )
  
      np.testing.assert_equal(actual, EXPECTED_RATINGS_MATRIX)
  
imports: import copy
  from unittest import mock
  import numpy
  import pandas
  import pytest
  from collie.utils import convert_to_implicit, create_ratings_matrix, df_to_html, df_to_interactions, get_init_arguments, remove_users_with_fewer_than_n_interactions, Timer
label_desc: Use image node_id 1 for calling a global function with example usage: test_create_ratings_matrix_not_sparse(explicit_df) without return types